Roger Woodham replies:melt, thaw and antonyms

melt

When something melts, it changes from a solid to a liquid state, usually because it is heated:

We also have the phrasal verbs melt away and melt (away) into meaning to disappear:

thaw

When something thaws it warms up slowly and changes gradually from a frozen state to a temperature above freezing point:

We also have the phrasal verb thaw out, which we use when referring to frozen food or if we have just come inside from very cold weather:

Hamlet, in the speech you refer to, Keith, is mourning the death of his father two months earlier and is distraught about his mother's hasty re-marriage to his father's brother. For this
reason he wishes that his flesh might melt into the dew.

We still use melt figuratively today when we speak of our feelings or emotions melting, e.g.:

Antonyms of melt and thaw would be:

freeze
harden
solidify
stiffen

Study the examples below to see how these verbs may be used: